golang-exercises/golangr/counter/main.go

package main

import (
	"fmt"
	"os"
	"strconv"
	"time"
)

var delay time.Duration
var num int16

func clear() {
	fmt.Print("\033[H\033[2J")
}

func main() {
	if len(os.Args) != 2 {
		fmt.Println("Usage: ./counter 1000 (measured in miliseconds)")
		os.Exit(1)
	}

	delay, err := strconv.Atoi(os.Args[1])

	if err != nil {
		fmt.Printf("\nERROR:\n%v\n", err)
	}

	for i := 0; true; i++ {
		clear()
		fmt.Println(i)
		time.Sleep(time.Duration(delay) * time.Millisecond)
	}
}